Characteristics of Deformation-Induced Transformation in Steel 2.25Cr1Mo

2008 ◽  
Vol 385-387 ◽  
pp. 509-512
Author(s):  
Qing Fen Li ◽  
Hong Bin Chen
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Alloy Steel ◽  
Volume Fraction ◽  
Controlled Rolling ◽  
Low Alloy Steel ◽  
Cooling Process ◽  
Controlled Cooling ◽  
Steel Microstructure ◽  
Steel Strength

Characteristics of deformation-induced transformation (DIT) in the refractory low alloy steel 2.25Cr1Mo were experimentally studied. Effect of different controlled-rolling and controlled-cooling process on the steel microstructure and mechanical properties were investigated and the mechanism was discussed. Results show that the grain size and the ferrite volume fraction were obviously affected by the rolling and cooling processes. Proper DIT technique may significantly accelerate the transformation of austenite to ferrite in the steel and improve the steel strength.

Development of a Fire Resistant Low Alloy Steel for Construction

2012 ◽  
Vol 535-537 ◽  
pp. 1973-1976
Author(s):  
Ying Sun
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Controlled Rolling ◽  
Impact Testing ◽  
Precipitation Strengthening ◽  
Low Carbon ◽  
Low Alloy Steel ◽  
Cooling Process ◽  
Controlled Cooling ◽  
Elevated Temperature Strength

Three fire-resistant steels for construction were developed, which are low carbon Mn-Cr-Mo steel microalloyed with Nb and free Nb. The mechanical properties of the alloy were studied by tensile and impact testing. The effects of parameters in controlled rolling and controlled cooling process on the mechanical properties and the microstructures of the steel were investigated. It is found that the precipitation strengthening is important strengthening way to improve the elevated temperature strength of fire-resistant steels.

Effect of controlled rolling on the mechanical properties of low-alloy steel H-beams

1986 ◽  
Vol 28 (4) ◽  
pp. 248-251
Author(s):  
V. M. Farber ◽  
V. N. Davydov ◽  
V. V. Machikhin ◽  
V. F. Evdokimov ◽  
E. G. Zudov
Keyword(s):  
Mechanical Properties ◽  
Alloy Steel ◽  
Controlled Rolling ◽  
Low Alloy Steel

scholarly journals Effect of Thermal Cycle on Microstructure Evolution and Mechanical Properties of Selective Laser Melted Low-Alloy Steel

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3625
Author(s):  
Xueliang Kang ◽  
Shiyun Dong ◽  
Hongbin Wang ◽  
Shixing Yan ◽  
Xiaoting Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Brittle Fracture ◽  
Alloy Steel ◽  
Lower Bainite ◽  
Granular Bainite ◽  
Low Alloy Steel ◽  
Traditional Methods ◽  
Average Grain Size ◽  
Solidification Microstructures

Low-alloy steel samples were successfully fabricated by selective laser melting (SLM). The evolution of the microstructure and the mechanical properties were investigated with different values of the energy area density (EAD). The results revealed that the initial solidification microstructures of the single tracks with different EADs were all martensite. However, the microstructures of bulk samples under different EADs were not martensite and differed significantly even from one another. When EAD increased from 47 to 142 J/mm2, the mixed lower bainite and martensite austenite microstructure changed to granular bainite; further, the morphology of bainite ferrite gradually changed from lath to multilateral. Moreover, with the increase of EAD, the grain size was remarkably reduced because of the increasing austenitizing periods and temperature during thermal cycling. The average grain size was 1.56 µm, 3.98 µm, and 6.31 µm with EADs of 142 J/mm2, 71 J/mm2, and 47 J/mm2, respectively. Yield strength and tensile strength of the SLM low-alloy steel increased with the increase in EAD; these values were significantly more than those of the alloys prepared by traditional methods. The microstructure of the SLM low-alloy steel samples is not uniform, and the inhomogeneity becomes more significant as EAD decreases. Simultaneously, when EAD decreases, the fracture mechanism changes from ductile to a mixture of ductile and brittle fracture; this is in contrast to the samples prepared by traditional methods. This study also found a stress concentration mechanism around large pores during plastic deformation that resulted in a brittle fracture. This indicates that large-sized pores significantly degrade the mechanical properties of the specimens.

Comparison of the strengthening effects of Nb, V, and Ti on the mechanical properties of 20MnSi low-alloy steel

2020 ◽  
Vol 111 (6) ◽  
pp. 504-510
Author(s):  
Qingxiao Zhang ◽  
Qing Yuan ◽  
Wenwei Qiao ◽  
Guanghui Chen ◽  
Guang Xu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Refinement ◽  
Alloy Steel ◽  
Precipitation Strengthening ◽  
Strengthening Effect ◽  
Strengthening Mechanisms ◽  
Low Alloy Steel ◽  
Average Grain Size ◽  
Base Steel

Abstract Three alloys, containing niobium, vanadium and titanium, respectively, were refined and the strengthening effect attained after adding them individually in a 20MnSi low-alloy rebar steel was investigated. The results show that the strengthening effect attained due to the addition of niobium is the best, whereas that due to the addition of titanium is the poorest. Grain refinement and precipitation strengthening are the main strengthening mechanisms observed in niobium-steel and vanadium-steel, whereas only precipitation strengthening is observed in titanium-steel. Moreover, the average grain size of niobium-steel is the smallest among the four types of steels, while the size of ferrite and pearlite microstructures show almost no obvious change as compared to the base steel in the case of titanium-steel. Furthermore, the volume fractions of ferrite and pearlite in the four tested steels have no noticeable change.

EFFECT OF DEFORMATION-INDUCED TRANSFORMATION PROCESS ON FERRITE GRAIN SIZE AND VOLUME FRACTION IN STEEL 12CR1MOV

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1197-1202
Author(s):  
QINGFEN LI ◽  
XIUFANG CUI ◽  
HONGBIN CHEN
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Cooling Rate ◽  
Deformation Temperature ◽  
Volume Fraction ◽  
Rolling Process ◽  
Controlled Rolling ◽  
Temperature Deformation ◽  
Controlled Cooling ◽  
Ferrite Grain Size

Effect of deformation induced transformation (DIT) process on ferrite grain size and ferrite transformation volume fraction in the refractory low alloy steel 12 Cr 1 MoV by controlled rolling and controlled cooling technology were experimentally studied. Simulation experiments of hot deformation were carried out with the Gleeble-1500 system. Single-pass and multi-pass hot rolling process with different deformation temperature, deformation reduction, strain rate and cooling rate were performed separately. The ferrite grain size decreased and the ferrite volume fraction increased with decreasing deformation temperature, and the extra-fine ferrite grain about 1.01µm was obtained when the deformation temperature reached 780°C. Higher deformation reduction resulted finer ferrite grain size and higher ferrite volume fraction. Both the ferrite grain size and ferrite volume fraction decreased with increasing strain rate. The ferrite grain size decreased but the ferrite volume fraction didn't change much when the cooling rate increased. The grain size and the ferrite volume fraction were improved more by three-passes than two-passes rolling. The mechanism of grain refinement by DIT was discussed.

Research on Simulating of Controlled Rolling and Controlled Cooling Process for Mo Micro-Alloy Steel

2008 ◽  
Vol 575-578 ◽  
pp. 595-599
Author(s):  
Gui Yan Li ◽  
Bao Chun Zhao ◽  
Zao Fu Pang ◽  
Yong Hao Liu ◽  
Hui Xia Ma
Keyword(s):  
Mechanical Property ◽  
Alloy Steel ◽  
Volume Fraction ◽  
Controlled Rolling ◽  
Rolling Temperature ◽  
Technological Parameters ◽  
Controlled Cooling ◽  
Transmission Electron ◽  
Two Stages ◽  
Microstructure And Mechanical Property

The transformation production and recrystallization for Mo Micro-alloy Steel had been carried out on the Gleeble-3800 thermo-mechanical simulator. Based on the schedule, TMCP was applied to two stages multi-pass hot rolling experiments and the influences of the technological parameters on microstructure and mechanical property were analyzed. The results showed that the microstructure, precipitation and mechanical property of Mo Micro-alloy steel were strongly affected by the start-rolling temperature, the end-rolling temperature, the cooling rate and the relaxation time. The appropriate parameters were used and the ideal volume fraction of the acicular ferrite was observed by using metallographic microscope and transmission electron microscope(TEM).

scholarly journals The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron

Metals ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 26 ◽  
Author(s):  
Beata Białobrzeska ◽  
Łukasz Konat ◽  
Robert Jasiński
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Alloy Steel ◽  
Low Alloy Steel ◽  
Austenite Grain Size ◽  
Austenite Grain
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